Molybdenum wire MCH 8 micron - 500 micron

Relevance

Molybdenum wire has a high elastic modulus, low coefficient of thermal expansion, viscosity, hardness, resistance to aggressive environments. These advantages allow to apply it in various fields of modern industry. It has excellent mechanical strength and corrosion resistance. Compared with tungsten — it is half the size, and therefore has a large specific strength (at t° to 1370°C).

Physical quality

The temperature at which the obtained data the features of t°C

20°C

The linear thermal expansion coefficient α [1/°C]

Of 4.9x10-6

Density [g/cm3]

10,2

The melting temperature t°C

2620°C

Specific heat at 20 °C [kJ/(kg·deg)]

0,256

The thermal conductivity K [W/(m·K)]

142

Electrical resistivity R, Mhmm2/m

0,054

Chemical properties

Mo is stable in cold alkali, but hot slowly destroyed. It dissolves hydrochloric, sulfuric acids at 80 °C. Nitric acid, Aqua Regia dissolve it only at 100 °C. the Impurities of carbon, oxygen, silicon, aluminum, nitrogen, iron, sulphur, calcium, phosphorus significantly change its properties. The bulk of these impurities increases the fragility. Most harmful of all impurities is considered to be oxygen. If it is contained in a volume 0,0008−0,004%, the low-melting oxides can lead to a sharp increase in brittleness of the material, hindering plastic deformation, especially in the simultaneous presence of carbon with nitrogen. With increasing percentage of oxygen than 0.015%, the processing pressure because of the fragility becomes impossible.

Disadvantages

Molybdenum refers to rare earth elements, in its purest form is quite difficult to identify, it is refractory and hard to work — all this affects the high cost of the final products.

The production of wire made of molybdenum

True annealing temperature, ° C

The diameter of molybdenum wire

1500−1550

200 — 800 µm

1450−1500

801 — 1000 µm

1400−1450

1001 — 1250 µm

1300−1350

1251 — 2500 µm

MOLYBDENUM WIRE FOR FILAMENT LAMPS GOST 27266−87.

Mark Mo

Application

Group

Type

Precision production

Wire diameter

MRN

The inputs of the core with the helix of molybdenum and its alloys, traverse

And

-

Normal

600−2500

MK

The core for the manufacture of molybdenum monosperma, hooks, supports, etc. parts of lamps

Quality requirements

Wire, ∅ 0.4 mm is available in black or dark gray, and the wire of larger diameter, usually light gray. In accordance with the technical specifications, not on its surface may be traces of oxidation, grease or other contaminants. The surface must be free of cracks, smooth, and without burrs. Requirements molybdenum wire ∅ 0.5 mm more not so hard, here are allowed burrs, beyond the minimum. In the special tables set forth the rules and tear stretching. Quality wire can withstand spiralization.

The grade of molybdenum

Ultimate strength, kgf/mm2

Wire diameter, µm

Group

Conditional tensile strength of the HS/mg/200mm

MCH-K

173 163 142

15 — 70 71 — 90 91 — 200

A, B

85 80 70

MK

121

200 — 500

And

60

MCH-KS

152 142 121

45 — 70 71 — 90 91 — 200

And

75 70 60

Application

Molybdenum wire has outstanding mechanical strength, refractoriness, corrosion resistance. It is resistant to most aggressive environments, and also in solutions of concentrated alkalis and acids — sulphuric, hydrofluoric and hydrochloric. The lifetime of molybdenum wire is significantly higher than the similar products of other metals. She is very reliable, durable, popular in the most difficult conditions of modern production, is widely used in the nuclear power industry, mechanical engineering, industrial chemistry. It is hardly replaceable in the manufacture of resistance elements for heating furnaces, lighting devices that require high heat resistance. Molybdenum piercing mandrels are used for punching stainless steel seamless pipes and for drilling steel. The most popular brand of wire is grade MCH.

The grade of molybdenum

Group

The condition of the wire

Wire diameter

Accuracy class production

The purpose of the wire

MCH

And

Black

20 — 2500 µm

1,2

support, hooks, beams, Plushenko core with the helix

B

Purified

20 — 1000 µm

at the core of helix, hooks of tubes

In

Annealed

details vacuum devices

G

Purified, annealed

at the core of helix, traverse

D

Annealed

1

at the core of helix

MRN

And

Black

600 — 2500 µm

1

In

Annealed

600 — 1000 µm

G

Purified, annealed

D

Annealed

1,2

traverse

MK

And

Black

200 — 2500 µm

1,2

the inputs to junction with metallic ceramics and refractory glass and other high-temperature parts

B

Purified

200 — 1000 µm

In

Annealed

G

Purified, annealed

Buy at best price

In stock LLC «AVEK global» — the widest range of products from rare and refractory metals. We offer wire any parameters at the best prices. Our specialists are ready to answer any questions and to help in the selection of necessary materials, upon request, will provide all the necessary information about the product, cost and delivery time. Rates depend on scope of delivery and additional conditions. For wholesale orders discounts. Buying products of the company «AVEK global», You will find a worthy partner.